<!DOCTYPE HTML>
<html lang="zh-CN">
<head>
    

<head><meta name="generator" content="Hexo 3.8.0">
    <meta charset="utf-8">
    <meta name="keywords" content="简单三层架构, Zhou•Yong">
    <meta name="description" content="简单三层架构Formnamespace 三层架构
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            Init">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="renderer" content="webkit|ie-stand|ie-comp">
    <meta name="mobile-web-app-capable" content="yes">
    <meta name="format-detection" content="telephone=no">
    <meta name="apple-mobile-web-app-capable" content="yes">
    <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
    <title>简单三层架构 | Zhou•Yong</title>
    <link rel="icon" type="image/png" href="/favicon.png">

    <link rel="stylesheet" type="text/css" href="/libs/awesome/css/font-awesome.min.css">
    <link rel="stylesheet" type="text/css" href="/libs/materialize/css/materialize.min.css">
    <link rel="stylesheet" type="text/css" href="/libs/aos/aos.css">
    <link rel="stylesheet" type="text/css" href="/libs/animate/animate.min.css">
    <link rel="stylesheet" type="text/css" href="/libs/lightGallery/css/lightgallery.min.css">
    <link rel="stylesheet" type="text/css" href="/css/matery.css">
    <link rel="stylesheet" type="text/css" href="/css/my.css">

    <script src="/libs/jquery/jquery-2.2.0.min.js"></script>
<link rel="stylesheet" href="/css/prism-tomorrow.css" type="text/css"></head>

</head>

<body>

<header class="navbar-fixed">
    <nav id="headNav" class="bg-color nav-transparent">
        <div id="navContainer" class="container">
            <div class="nav-wrapper">
                <div class="brand-logo">
                    <a href="/" class="waves-effect waves-light">
                        
                        <img src="/medias/logo.png" class="logo-img hide-on-small-only">
                        
                        <span class="logo-span">Zhou•Yong</span>
                    </a>
                </div>
                <a href="#" data-activates="mobile-nav" class="button-collapse"><i class="fa fa-navicon"></i></a>
<ul class="right">
    
    <li class="hide-on-med-and-down">
        <a href="/" class="waves-effect waves-light">
            
            <i class="fa fa-home"></i>
            
            <span>主页</span>
        </a>
    </li>
    
    <li class="hide-on-med-and-down">
        <a href="/about" class="waves-effect waves-light">
            
            <i class="fa fa-user-circle-o"></i>
            
            <span>个人介绍</span>
        </a>
    </li>
    
    <li class="hide-on-med-and-down">
        <a href="/categories" class="waves-effect waves-light">
            
            <i class="fa fa-bookmark"></i>
            
            <span>分类</span>
        </a>
    </li>
    
    <li class="hide-on-med-and-down">
        <a href="/tags" class="waves-effect waves-light">
            
            <i class="fa fa-tags"></i>
            
            <span>标签</span>
        </a>
    </li>
    
    <li class="hide-on-med-and-down">
        <a href="/friends" class="waves-effect waves-light">
            
            <i class="fa fa-address-book"></i>
            
            <span>推荐</span>
        </a>
    </li>
    
    <li>
        <a id="toggleSearch" class="waves-effect waves-light">
            <i id="searchIcon" class="mdi-action-search"></i>
        </a>
    </li>

</ul>

<div class="side-nav" id="mobile-nav">

    <div class="mobile-head bg-color">
        
        <img src="/medias/logo.png" class="logo-img circle responsive-img">
        
        <div class="logo-name">Zhou•Yong</div>
        <div class="logo-desc">
            
            你迈出的步伐不非得很大，只要你是在正确的方向前进就行
            
        </div>
    </div>

    <ul class="menu-list mobile-menu-list">
        
        <li>
            <a href="/" class="waves-effect waves-light">
                
                <i class="fa fa-fw fa-home"></i>
                
                主页
            </a>
        </li>
        
        <li>
            <a href="/about" class="waves-effect waves-light">
                
                <i class="fa fa-fw fa-user-circle-o"></i>
                
                个人介绍
            </a>
        </li>
        
        <li>
            <a href="/categories" class="waves-effect waves-light">
                
                <i class="fa fa-fw fa-bookmark"></i>
                
                分类
            </a>
        </li>
        
        <li>
            <a href="/tags" class="waves-effect waves-light">
                
                <i class="fa fa-fw fa-tags"></i>
                
                标签
            </a>
        </li>
        
        <li>
            <a href="/friends" class="waves-effect waves-light">
                
                <i class="fa fa-fw fa-address-book"></i>
                
                推荐
            </a>
        </li>
        
        
    </ul>

    <div class="social-link"><a href="#!" class="tooltipped" data-tooltip="邮件联系我: zy20081@126.com" data-position="top" data-delay="50">
    <i class="fa fa-envelope-open"></i>
</a>
<a href="#!" class="tooltipped" data-tooltip="QQ联系我: 314153271" data-position="top" data-delay="50">
    <i class="fa fa-qq"></i>
</a>

<a href="/atom.xml" class="tooltipped" target="_blank" data-tooltip="RSS 订阅" data-position="top" data-delay="50">
    <i class="fa fa-rss"></i>
</a>
</div>
</div>

            </div>
        </div>

        
    </nav>
</header>





<div class="bg-cover post-cover" style="background-image: url('/medias/featureimages/12.jpg')">
    <div class="container">
        <div class="row">
            <div class="col s12 m12 l12">
                <div class="brand">
                    <div class="description center-align post-title">
                        简单三层架构
                    </div>
                </div>
            </div>
        </div>
    </div>
</div>



<main class="post-container content">

    
    <link rel="stylesheet" href="/libs/tocbot/tocbot.css">
<style>
    #articleContent h1,
    #articleContent h2,
    #articleContent h3,
    #articleContent h4,
    #articleContent h5,
    #articleContent h6 {
        padding-top: 76px;
        margin-top: -76px;
    }

    #articleContent h1 {
        line-height: 3.5rem;
    }

    #articleContent h2 {
        line-height: 3.2rem;
    }

    #articleContent h3 {
        line-height: 2.8rem;
    }

    #articleContent h4 {
        line-height: 2.5rem;
    }

    #articleContent h5 {
        line-height: 2.2rem;
    }

    #articleContent h6 {
        line-height: 1.9rem;
    }

    #articleContent :focus {
        outline: none;
    }

    .toc-fixed {
        position: fixed;
        top: 64px;
    }

    .toc-widget {
        padding-left: 20px;
    }

    .toc-widget .toc-title {
        margin: 35px 0 15px 0;
        padding-left: 17px;
        font-size: 1.5rem;
        font-weight: bold;
        line-height: 1.5rem;
    }

    .toc-widget ol {
        padding: 0;
        list-style: none;
    }

    #toc-content ol {
        padding-left: 10px;
    }

    #toc-content ol li {
        padding-left: 10px;
    }

    #toc-content .toc-link:hover {
        color: #42b983;
        font-weight: 700;
        text-decoration: underline;
    }

    #toc-content .toc-link::before {
        background-color: transparent;
        max-height: 25px;
    }

    #toc-content .is-active-link {
        color: #42b983;
    }

    #toc-content .is-active-link::before {
        background-color: #42b983;
    }
</style>
<div class="row">
    <div class="col s12 m12 l9">
        <!-- 文章内容详情 -->
<div id="artDetail">
    <div class="card">
        <div class="card-content article-info">
            
            <div class="article-tag">
                
                <a href="/tags/ASP-NET/" target="_blank">
                    <span class="chip bg-color">ASP.NET</span>
                </a>
                
            </div>
            
            <div class="post-info">
                
                <span class="post-cate">
                    <i class="fa fa-bookmark fa-fw icon-category"></i>
                    
                    <a href="/categories/ASP-NET/" class="post-category" target="_blank">
                        ASP.NET
                    </a>
                    
                </span>
                

                <span class="post-date">
                    <i class="fa fa-clock-o fa-fw"></i>2019-01-16
                </span>
            </div>
        </div>
        <hr>
        <div class="card-content article-card-content">
            <div id="articleContent">
                <h2 id="简单三层架构"><a href="#简单三层架构" class="headerlink" title="简单三层架构"></a>简单三层架构</h2><h2 id="Form"><a href="#Form" class="headerlink" title="Form"></a>Form</h2><pre class=" language-bash"><code class="language-bash">namespace 三层架构
<span class="token punctuation">{</span>
    public partial class Form1 <span class="token keyword">:</span> Form
    <span class="token punctuation">{</span>
        public Form1<span class="token punctuation">(</span><span class="token punctuation">)</span>
        <span class="token punctuation">{</span>
            InitializeComponent<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>

        private void btExecutescalar_Click<span class="token punctuation">(</span>object sender, EventArgs e<span class="token punctuation">)</span>//查询一个值
        <span class="token punctuation">{</span>
            <span class="token function">users</span> model <span class="token operator">=</span> new users<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            model.userid <span class="token operator">=</span> <span class="token string">"admin"</span><span class="token punctuation">;</span>
            model.userpass <span class="token operator">=</span> 123456<span class="token punctuation">;</span>
            PersonBLL person <span class="token operator">=</span> new PersonBLL<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            int ExecuteScalar<span class="token operator">=</span> person.selectNew<span class="token punctuation">(</span>model<span class="token punctuation">)</span><span class="token punctuation">;</span>
            MessageBox.Show<span class="token punctuation">(</span><span class="token string">"查询到的值为"</span>+ExecuteScalar.ToString<span class="token punctuation">(</span><span class="token punctuation">))</span><span class="token punctuation">;</span>


        <span class="token punctuation">}</span>

        private void btnInsert_Click<span class="token punctuation">(</span>object sender, EventArgs e<span class="token punctuation">)</span>//添加数据
        <span class="token punctuation">{</span>
            <span class="token function">users</span> model <span class="token operator">=</span> new users<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            model.userid <span class="token operator">=</span> <span class="token string">"xiao"</span><span class="token punctuation">;</span>
            model.userpass <span class="token operator">=</span> 1234567<span class="token punctuation">;</span>
            PersonBLL person <span class="token operator">=</span> new PersonBLL<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            person.insert<span class="token punctuation">(</span>model<span class="token punctuation">)</span><span class="token punctuation">;</span>
            MessageBox.Show<span class="token punctuation">(</span><span class="token string">"添加成功"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>

        private void btnDel_Click<span class="token punctuation">(</span>object sender, EventArgs e<span class="token punctuation">)</span>//删除数据
        <span class="token punctuation">{</span>
            PersonBLL person <span class="token operator">=</span> new PersonBLL<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token function">users</span> model <span class="token operator">=</span> new users<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            model.userid <span class="token operator">=</span> <span class="token string">"xiaomi"</span><span class="token punctuation">;</span>
            person.delete<span class="token punctuation">(</span>model<span class="token punctuation">)</span><span class="token punctuation">;</span>
            MessageBox.Show<span class="token punctuation">(</span><span class="token string">"删除成功"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

        <span class="token punctuation">}</span>

        private void btnUpdate_Click<span class="token punctuation">(</span>object sender, EventArgs e<span class="token punctuation">)</span>//更新
        <span class="token punctuation">{</span>
            PersonBLL person <span class="token operator">=</span> new PersonBLL<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token function">users</span> model <span class="token operator">=</span> new users<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            model.userid <span class="token operator">=</span> <span class="token string">"zhouyong"</span><span class="token punctuation">;</span>
            person.update<span class="token punctuation">(</span>2,model<span class="token punctuation">)</span><span class="token punctuation">;</span>
            MessageBox.Show<span class="token punctuation">(</span><span class="token string">"更新成功成功"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>

        private void btnSelect_Click<span class="token punctuation">(</span>object sender, EventArgs e<span class="token punctuation">)</span>//查询数据
        <span class="token punctuation">{</span>
            PersonBLL person <span class="token operator">=</span> new PersonBLL<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token function">users</span> model <span class="token operator">=</span> new users<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            model<span class="token operator">=</span>person.get<span class="token punctuation">(</span><span class="token string">"456"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            MessageBox.Show<span class="token punctuation">(</span><span class="token string">"用户名"</span>+model.userid+<span class="token string">"密码"</span>+model.userpass<span class="token punctuation">)</span><span class="token punctuation">;</span>

        <span class="token punctuation">}</span>

        private void Form1_Load<span class="token punctuation">(</span>object sender, EventArgs e<span class="token punctuation">)</span>
        <span class="token punctuation">{</span>
            dgvselect.DataSource <span class="token operator">=</span> new PersonBLL<span class="token punctuation">(</span><span class="token punctuation">)</span>.GetAll<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> //显示数据
        <span class="token punctuation">}</span>

    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

</code></pre>
<h2 id="DAL"><a href="#DAL" class="headerlink" title="DAL"></a>DAL</h2><pre class=" language-bash"><code class="language-bash">using System<span class="token punctuation">;</span>
using System.Collections.Generic<span class="token punctuation">;</span>
using System.Linq<span class="token punctuation">;</span>
using System.Text<span class="token punctuation">;</span>
using 三层架构.Model<span class="token punctuation">;</span>
using System.Data.SqlClient<span class="token punctuation">;</span>
using System.Data<span class="token punctuation">;</span>
namespace 三层架构.DAL
<span class="token punctuation">{</span>
    class PersonDAL
    <span class="token punctuation">{</span>
        public int selectNew<span class="token punctuation">(</span>users model<span class="token punctuation">)</span>//查询单个数据
        <span class="token punctuation">{</span>
            object ExecuteScalar <span class="token operator">=</span> sqlHelper.ExecuteScalar<span class="token punctuation">(</span><span class="token string">"select userpass from username where userid=@id and userpass=@pwd"</span>, new SqlParameter<span class="token punctuation">(</span><span class="token string">"@id"</span>, model.userid<span class="token punctuation">)</span>, new SqlParameter<span class="token punctuation">(</span><span class="token string">"@pwd"</span>, model.userpass<span class="token punctuation">))</span><span class="token punctuation">;</span>
            <span class="token keyword">return</span> Convert.ToInt32<span class="token punctuation">(</span>ExecuteScalar<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        public int insert<span class="token punctuation">(</span>users model<span class="token punctuation">)</span> //增加数据
        <span class="token punctuation">{</span>

         <span class="token keyword">return</span> sqlHelper.ExecNonQuery<span class="token punctuation">(</span><span class="token string">"insert into username(userid,userpass) values(@id,@pass)"</span>, new SqlParameter<span class="token punctuation">(</span><span class="token string">"@id"</span>, model.userid<span class="token punctuation">)</span>, new SqlParameter<span class="token punctuation">(</span><span class="token string">"@pass"</span>, model.userpass<span class="token punctuation">))</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        public int delete<span class="token punctuation">(</span>users model<span class="token punctuation">)</span> //删除数据
        <span class="token punctuation">{</span>
          <span class="token keyword">return</span> sqlHelper.ExecNonQuery<span class="token punctuation">(</span><span class="token string">"delete from username where userid=@id"</span>,new SqlParameter<span class="token punctuation">(</span><span class="token string">"id"</span>,model.userid<span class="token punctuation">))</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        public int update<span class="token punctuation">(</span>int id,users model<span class="token punctuation">)</span> //更新数据
        <span class="token punctuation">{</span>
            <span class="token keyword">return</span> sqlHelper.ExecNonQuery<span class="token punctuation">(</span><span class="token string">"update username set userid =@userid where ID=@id"</span>, new SqlParameter<span class="token punctuation">(</span><span class="token string">"@userid"</span>,model.userid<span class="token punctuation">)</span>, new SqlParameter<span class="token punctuation">(</span><span class="token string">"@id"</span>,id<span class="token punctuation">))</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        public <span class="token function">users</span> get<span class="token punctuation">(</span>string id<span class="token punctuation">)</span> //查询数据
        <span class="token punctuation">{</span>
            DataTable dt <span class="token operator">=</span> sqlHelper.ExecuteDataTable<span class="token punctuation">(</span><span class="token string">"select * from username where userid=@id"</span>, new SqlParameter<span class="token punctuation">(</span><span class="token string">"@id"</span>, id<span class="token punctuation">))</span><span class="token punctuation">;</span>
            <span class="token keyword">if</span> <span class="token punctuation">(</span>dt.Rows.Count <span class="token operator">&lt;=</span> 0<span class="token punctuation">)</span>
            <span class="token punctuation">{</span>
                <span class="token keyword">return</span> null<span class="token punctuation">;</span>
            <span class="token punctuation">}</span>
            <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>dt.Rows.Count <span class="token operator">>=</span> 1<span class="token punctuation">)</span>
            <span class="token punctuation">{</span>
                <span class="token function">users</span> model <span class="token operator">=</span> new users<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                DataRow row <span class="token operator">=</span> dt.Rows<span class="token punctuation">[</span>0<span class="token punctuation">]</span><span class="token punctuation">;</span>
                model.userid <span class="token operator">=</span> row<span class="token punctuation">[</span><span class="token string">"userid"</span><span class="token punctuation">]</span>.ToString<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                model.userpass <span class="token operator">=</span> Convert.ToInt32<span class="token punctuation">(</span>row<span class="token punctuation">[</span><span class="token string">"userpass"</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                <span class="token keyword">return</span> model<span class="token punctuation">;</span>
            <span class="token punctuation">}</span>
            <span class="token keyword">else</span> 
            <span class="token punctuation">{</span>
                throw new Exception<span class="token punctuation">(</span><span class="token string">""</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>
        <span class="token punctuation">}</span>
        public IEnumerable<span class="token operator">&lt;</span>users<span class="token operator">></span> GetAll<span class="token punctuation">(</span><span class="token punctuation">)</span> //查询所有值用到了IEumerable接口
        <span class="token punctuation">{</span>
            DataTable dt <span class="token operator">=</span> sqlHelper.ExecuteDataTable<span class="token punctuation">(</span><span class="token string">"select * from username"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            List<span class="token operator">&lt;</span>users<span class="token operator">></span> list<span class="token operator">=</span>new List<span class="token operator">&lt;</span>users<span class="token operator">></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            foreach <span class="token punctuation">(</span>DataRow row <span class="token keyword">in</span> dt.Rows<span class="token punctuation">)</span> 
            <span class="token punctuation">{</span>
                <span class="token function">users</span> model <span class="token operator">=</span> new users<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                model.id <span class="token operator">=</span> Convert.ToInt32<span class="token punctuation">(</span>row<span class="token punctuation">[</span><span class="token string">"id"</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                model.userid <span class="token operator">=</span> row<span class="token punctuation">[</span><span class="token string">"userid"</span><span class="token punctuation">]</span>.ToString<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                model.userpass <span class="token operator">=</span> Convert.ToInt32<span class="token punctuation">(</span>row<span class="token punctuation">[</span><span class="token string">"userpass"</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                list.Add<span class="token punctuation">(</span>model<span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>
            <span class="token keyword">return</span> list<span class="token punctuation">;</span>

        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

</code></pre>
<h2 id="sqlHelper"><a href="#sqlHelper" class="headerlink" title="sqlHelper"></a>sqlHelper</h2><pre class=" language-bash"><code class="language-bash">using System<span class="token punctuation">;</span>
using System.Collections.Generic<span class="token punctuation">;</span>
using System.Linq<span class="token punctuation">;</span>
using System.Text<span class="token punctuation">;</span>
using System.Data<span class="token punctuation">;</span>
using System.Configuration<span class="token punctuation">;</span>
using System.Data.SqlClient<span class="token punctuation">;</span>
namespace 三层架构.DAL
<span class="token punctuation">{</span>
    class sqlHelper
    <span class="token punctuation">{</span>
        private static string constr <span class="token operator">=</span> ConfigurationManager.ConnectionStrings<span class="token punctuation">[</span><span class="token string">"conStr"</span><span class="token punctuation">]</span>.ConnectionString<span class="token punctuation">;</span>
        //封装方法的原则：把不变大的放到方法里，把变化的放参数中到
        private static SqlConnection conn<span class="token punctuation">;</span> //连接

        public static SqlConnection Conn
        <span class="token punctuation">{</span>
            get
            <span class="token punctuation">{</span>
                <span class="token keyword">if</span> <span class="token punctuation">(</span>conn <span class="token operator">==</span> null <span class="token operator">||</span> conn.State <span class="token operator">==</span> ConnectionState.Broken<span class="token punctuation">)</span>
                <span class="token punctuation">{</span>
                    conn <span class="token operator">=</span> new SqlConnection<span class="token punctuation">(</span>constr<span class="token punctuation">)</span><span class="token punctuation">;</span>
                <span class="token punctuation">}</span>
                <span class="token keyword">return</span> conn<span class="token punctuation">;</span>
            <span class="token punctuation">}</span>

        <span class="token punctuation">}</span>

        public static int ExecuteNonQuery<span class="token punctuation">(</span>string sql<span class="token punctuation">)</span>//参数执行的语句 执行增删改
        <span class="token punctuation">{</span>
            using <span class="token punctuation">(</span>SqlConnection conn <span class="token operator">=</span> new SqlConnection<span class="token punctuation">(</span>constr<span class="token punctuation">))</span>
            <span class="token punctuation">{</span>
                conn.Open<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                using <span class="token punctuation">(</span>SqlCommand cmd <span class="token operator">=</span> conn.CreateCommand<span class="token punctuation">(</span><span class="token punctuation">))</span>
                <span class="token punctuation">{</span>
                    cmd.CommandText <span class="token operator">=</span> sql<span class="token punctuation">;</span>
                    <span class="token keyword">return</span> cmd.ExecuteNonQuery<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                <span class="token punctuation">}</span>
            <span class="token punctuation">}</span>
        <span class="token punctuation">}</span>
        public static int ExecNonQuery<span class="token punctuation">(</span>string sqlstr, params SqlParameter<span class="token punctuation">[</span><span class="token punctuation">]</span> paras<span class="token punctuation">)</span>
        <span class="token punctuation">{</span>
            SqlCommand cmd <span class="token operator">=</span> new SqlCommand<span class="token punctuation">(</span>sqlstr, Conn<span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token keyword">if</span> <span class="token punctuation">(</span>paras <span class="token operator">!=</span> null <span class="token operator">&amp;&amp;</span> paras.Length <span class="token operator">></span> 0<span class="token punctuation">)</span>
            <span class="token punctuation">{</span>
                cmd.Parameters.AddRange<span class="token punctuation">(</span>paras<span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>

            Conn.Open<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            int res <span class="token operator">=</span> 0<span class="token punctuation">;</span>
            res <span class="token operator">=</span> cmd.ExecuteNonQuery<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            Conn.Close<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token keyword">return</span> res<span class="token punctuation">;</span>

        <span class="token punctuation">}</span>
        public static object ExecuteScalar<span class="token punctuation">(</span>string sql<span class="token punctuation">)</span> //查询单个值
        <span class="token punctuation">{</span>
            using <span class="token punctuation">(</span>SqlConnection conn <span class="token operator">=</span> new SqlConnection<span class="token punctuation">(</span>constr<span class="token punctuation">))</span>
            <span class="token punctuation">{</span>
                conn.Open<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                using <span class="token punctuation">(</span>SqlCommand cmd <span class="token operator">=</span> conn.CreateCommand<span class="token punctuation">(</span><span class="token punctuation">))</span>
                <span class="token punctuation">{</span>
                    cmd.CommandText <span class="token operator">=</span> sql<span class="token punctuation">;</span>
                    <span class="token keyword">return</span> cmd.ExecuteScalar<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                <span class="token punctuation">}</span>
            <span class="token punctuation">}</span>
        <span class="token punctuation">}</span>
        public static object ExecuteScalar<span class="token punctuation">(</span>string sql,params SqlParameter<span class="token punctuation">[</span><span class="token punctuation">]</span> paras<span class="token punctuation">)</span> //查询单个值
        <span class="token punctuation">{</span>
            using <span class="token punctuation">(</span>SqlConnection conn <span class="token operator">=</span> new SqlConnection<span class="token punctuation">(</span>constr<span class="token punctuation">))</span>
            <span class="token punctuation">{</span>
                conn.Open<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                using <span class="token punctuation">(</span>SqlCommand cmd <span class="token operator">=</span> conn.CreateCommand<span class="token punctuation">(</span><span class="token punctuation">))</span>
                <span class="token punctuation">{</span>
                    cmd.Parameters.AddRange<span class="token punctuation">(</span>paras<span class="token punctuation">)</span><span class="token punctuation">;</span>
                    cmd.CommandText <span class="token operator">=</span> sql<span class="token punctuation">;</span>
                    <span class="token keyword">return</span> cmd.ExecuteScalar<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                <span class="token punctuation">}</span>
            <span class="token punctuation">}</span>
        <span class="token punctuation">}</span>
        public static DataTable ExecuteDataTable<span class="token punctuation">(</span>string sql, params SqlParameter<span class="token punctuation">[</span><span class="token punctuation">]</span> paras<span class="token punctuation">)</span> //查询结果集比较少的sql
        <span class="token punctuation">{</span>
            SqlCommand cmd <span class="token operator">=</span> new SqlCommand<span class="token punctuation">(</span>sql, Conn<span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token keyword">if</span> <span class="token punctuation">(</span>paras <span class="token operator">!=</span> null <span class="token operator">&amp;&amp;</span> paras.Length <span class="token operator">></span> 0<span class="token punctuation">)</span>
            <span class="token punctuation">{</span>
                cmd.Parameters.AddRange<span class="token punctuation">(</span>paras<span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>
            SqlDataAdapter adapter <span class="token operator">=</span> new SqlDataAdapter<span class="token punctuation">(</span>cmd<span class="token punctuation">)</span><span class="token punctuation">;</span>
            DataTable dt <span class="token operator">=</span> new DataTable<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            try
            <span class="token punctuation">{</span>

                adapter.Fill<span class="token punctuation">(</span>dt<span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>
            catch <span class="token punctuation">(</span>Exception ex<span class="token punctuation">)</span>
            <span class="token punctuation">{</span>

                throw ex<span class="token punctuation">;</span>
            <span class="token punctuation">}</span>
            <span class="token keyword">return</span> dt<span class="token punctuation">;</span>

        <span class="token punctuation">}</span>


    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

</code></pre>
<h2 id="App-config"><a href="#App-config" class="headerlink" title="App.config"></a>App.config</h2><pre class=" language-bash"><code class="language-bash">?xml version<span class="token operator">=</span><span class="token string">"1.0"</span> encoding<span class="token operator">=</span><span class="token string">"utf-8"</span> ?<span class="token operator">></span>
<span class="token operator">&lt;</span>configuration<span class="token operator">></span>
  <span class="token operator">&lt;</span>connectionStrings<span class="token operator">></span>
    <span class="token operator">&lt;</span>add name<span class="token operator">=</span><span class="token string">"conStr"</span> connectionString<span class="token operator">=</span><span class="token string">"server=.;database=hushi;uid=sa;pwd=sa;"</span>/<span class="token operator">></span>
  <span class="token operator">&lt;</span>/connectionStrings<span class="token operator">></span>
<span class="token operator">&lt;</span>/configuration<span class="token operator">></span>
</code></pre>
<h2 id="BLL"><a href="#BLL" class="headerlink" title="BLL"></a>BLL</h2><pre class=" language-bash"><code class="language-bash">namespace 三层架构.BLL
<span class="token punctuation">{</span>
    class PersonBLL
    <span class="token punctuation">{</span>
        public int selectNew<span class="token punctuation">(</span>users model<span class="token punctuation">)</span>//查询单个数据
        <span class="token punctuation">{</span>
            <span class="token keyword">return</span> new PersonDAL<span class="token punctuation">(</span><span class="token punctuation">)</span>.selectNew<span class="token punctuation">(</span>model<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        public int insert<span class="token punctuation">(</span>users model<span class="token punctuation">)</span> //增加数据
        <span class="token punctuation">{</span>

            <span class="token keyword">return</span> new PersonDAL<span class="token punctuation">(</span><span class="token punctuation">)</span>.insert<span class="token punctuation">(</span>model<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        public int delete<span class="token punctuation">(</span>users model<span class="token punctuation">)</span> //删除数据
        <span class="token punctuation">{</span>
            <span class="token keyword">return</span> new PersonDAL<span class="token punctuation">(</span><span class="token punctuation">)</span>.delete<span class="token punctuation">(</span>model<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        public int update<span class="token punctuation">(</span>int id,users model<span class="token punctuation">)</span> //删除数据
        <span class="token punctuation">{</span>
            <span class="token keyword">return</span> new PersonDAL<span class="token punctuation">(</span><span class="token punctuation">)</span>.update<span class="token punctuation">(</span>id,model<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        public <span class="token function">users</span> get<span class="token punctuation">(</span>string id<span class="token punctuation">)</span> //查询数据
        <span class="token punctuation">{</span>
            <span class="token keyword">return</span> new PersonDAL<span class="token punctuation">(</span><span class="token punctuation">)</span>.get<span class="token punctuation">(</span>id<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        public IEnumerable<span class="token operator">&lt;</span>users<span class="token operator">></span> GetAll<span class="token punctuation">(</span><span class="token punctuation">)</span> //查询所有数据
        <span class="token punctuation">{</span>
            <span class="token keyword">return</span> new PersonDAL<span class="token punctuation">(</span><span class="token punctuation">)</span>.GetAll<span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p>github代码下载：<a href="https://github.com/zy20081/practice.git" target="_blank" rel="noopener">https://github.com/zy20081/practice.git</a></p>

            </div>
            <hr>

            
            <style>
    #reward {
        margin: 40px 0;
        text-align: center;
    }

    #reward .reward-link {
        font-size: 1.88rem;
    }

    #reward .btn-floating:hover {
        box-shadow: 0 6px 12px rgba(0, 0, 0, 0.2), 0 5px 15px rgba(0, 0, 0, 0.2);
    }

    #rewardModal {
        width: 320px;
        height: 350px;
    }

    #rewardModal .reward-title {
        margin: 15px auto;
        padding-bottom: 5px;
    }

    #rewardModal .modal-content {
        padding: 10px;
    }

    #rewardModal .close {
        position: absolute;
        right: 15px;
        top: 15px;
        color: rgba(0, 0, 0, 0.5);
        font-size: 1.3rem;
        line-height: 20px;
        cursor: pointer;
    }

    #rewardModal .reward-tabs {
        margin: 0 auto;
        width: 210px;
    }

    .reward-tabs .tabs {
        height: 38px;
        margin: 10px auto;
        padding-left: 0;
    }

    .reward-tabs .tabs .tab {
        height: 38px;
        line-height: 38px;
    }

    .reward-tabs .tab a {
        color: #fff;
        background-color: #ccc;
    }

    .reward-tabs .tab a:hover {
        color: #fff;
    }

    .reward-tabs .wechat-tab .active {
        color: #fff;
        background-color: #22AB38;
    }

    .reward-tabs .alipay-tab .active {
        color: #fff;
        background-color: #019FE8;
    }

    .reward-tabs .reward-img {
        width: 210px;
        height: 210px;
    }
</style>

<div id="reward">
    <a class="reward-link btn-floating btn-large waves-effect waves-light red">赏</a>

    <!-- Modal Structure -->
    <div id="rewardModal" class="modal">
        <div class="modal-content">
            <a class="close"><i class="fa fa-close"></i></a>
            <h4 class="reward-title">你的赏识是我前进的动力</h4>
            <div class="reward-content">
                <div class="reward-tabs">
                    <ul class="tabs">
                        <li class="tab wechat-tab waves-effect waves-light"><a class="active" href="#wechat">微信</a></li>
                        <li class="tab alipay-tab waves-effect waves-light"><a href="#alipay">支付宝</a></li>
                    </ul>
                    <div id="wechat">
                        <img src="/medias/reward/wechat.png" class="reward-img" alt="微信打赏二维码">
                    </div>
                    <div id="alipay">
                        <img src="/medias/reward/alipay.jpg" class="reward-img" alt="支付宝打赏二维码">
                    </div>
                </div>
            </div>
        </div>
    </div>
</div>

<script>
    $(function () {
        $('#reward .reward-link').on('click', function () {
            $('#rewardModal').openModal();
        });

        $('#rewardModal .close').on('click', function () {
            $('#rewardModal').closeModal();
        });
    });
</script>
            

            <link rel="stylesheet" type="text/css" href="/libs/share/css/share.min.css">

<div id="article-share">
    
    <div class="social-share" data-disabled="qzone" data-wechat-qrcode-helper="<p>微信里点“发现”->“扫一扫”二维码便可查看分享。</p>"></div>
    
</div>

<script src="/libs/share/js/social-share.min.js"></script>

            <div class="reprint">
                <p>
                    <span class="reprint-tip">转载请注明: </span>
                    <a href="https://zy20081.github.io" class="b-link-green">Zhou•Yong</a>
                    <i class="fa fa-angle-right fa-lg fa-fw text-color"></i>
                    <a href="/2019/01/16/jian-dan-san-ceng-jia-gou/" class="b-link-green">简单三层架构</a>
                </p>
            </div>
        </div>
    </div>

    

    

    

    

    

    

<article id="prenext-posts" class="prev-next articles">
    <div class="row article-row">
        
        <div class="article col s12 m6" data-aos="fade-up">
            <div class="article-badge left-badge text-color">上一篇</div>
            <div class="card">
                <a href="/2019/01/16/json-chu-li/">
                    <div class="card-image">
                        
                        
                        <img src="/medias/featureimages/22.jpg" class="responsive-img" alt="json处理">
                        
                        <span class="card-title">json处理</span>
                    </div>
                </a>
                <div class="card-content article-content">
                    <div class="summary">json常见转换函数从一个字符串中解析出json对象 ： JSON.parse() 从一个对象中解析出字符串 : JSON.stringify(data) 常见的还有：eval(“(“+A+”)”); 也可以把 一个字符串中解析出json对</div>
                    <div class="publish-info">
                        <span class="publish-date">
                            <i class="fa fa-clock-o fa-fw icon-date"></i>2019-01-16
                        </span>
                        <span class="publish-author">
                            
                            <i class="fa fa-bookmark fa-fw icon-category"></i>
                            
                            <a href="/categories/前端/" class="post-category" target="_blank">
                                    前端
                                </a>
                            
                            
                        </span>
                    </div>
                </div>
                
                <div class="card-action article-tags">
                    
                    <a href="/tags/jQuery/" target="_blank">
                        <span class="chip bg-color">jQuery</span>
                    </a>
                    
                </div>
                
            </div>
        </div>
        
        
        <div class="article col s12 m6" data-aos="fade-up">
            <div class="article-badge right-badge text-color">下一篇</div>
            <div class="card">
                <a href="/2019/01/16/gou-zao-han-shu/">
                    <div class="card-image">
                        
                        
                        <img src="/medias/featureimages/7.jpg" class="responsive-img" alt="构造函数">
                        
                        <span class="card-title">构造函数</span>
                    </div>
                </a>
                <div class="card-content article-content">
                    <div class="summary">构造函数构造函数主要是用来创建对象时为对象赋初值来初始化对象。总与new运算符一起使用在创建对象的语句中 。A a=new A();
构造函数具有和类一样的名称；但它是一个函数具有函数的所有特性，同一个类里面可以有多个参数不同的构造函数，也</div>
                    <div class="publish-info">
                            <span class="publish-date">
                                <i class="fa fa-clock-o fa-fw icon-date"></i>2019-01-16
                            </span>
                        <span class="publish-author">
                            
                            <i class="fa fa-bookmark fa-fw icon-category"></i>
                            
                            <a href="/categories/C/" class="post-category" target="_blank">
                                    C#
                                </a>
                            
                            
                        </span>
                    </div>
                </div>
                
                <div class="card-action article-tags">
                    
                    <a href="/tags/C-基础知识/" target="_blank">
                        <span class="chip bg-color">C# 基础知识</span>
                    </a>
                    
                    <a href="/tags/C/" target="_blank">
                        <span class="chip bg-color">C#</span>
                    </a>
                    
                </div>
                
            </div>
        </div>
        
    </div>
</article>
</div>


    </div>
    <div class="col l3 hide-on-med-and-down">
        <div class="toc-widget">
            <div class="toc-title">目录</div>
            <div id="toc-content">

            </div>
        </div>
    </div>
</div>

<script src="/libs/tocbot/tocbot.min.js"></script>
<script>
    $(function () {
        tocbot.init({
            tocSelector: '#toc-content',
            contentSelector: '#articleContent',
            headingSelector: 'h2, h3, h4'
        });

        // modify the toc link href to support Chinese.
        let i = 0;
        let tocHeading = 'toc-heading-';
        $('#toc-content a').each(function () {
            $(this).attr('href', '#' + tocHeading + (++i));
        });

        // modify the heading title id to support Chinese.
        i = 0;
        $('#articleContent').children('h2, h3, h4').each(function () {
            $(this).attr('id', tocHeading + (++i));
        });

        // Set scroll toc fixed.
        let tocHeight = parseInt($(window).height() * 0.4 - 64);
        let $tocWidget = $('.toc-widget');
        $(window).scroll(function () {
            let scroll = $(window).scrollTop();
            /* add post toc fixed. */
            if (scroll > tocHeight) {
                $tocWidget.addClass('toc-fixed');
            } else {
                $tocWidget.removeClass('toc-fixed');
            }
        });
    });
</script>
    

</main>


<footer class="page-footer bg-color">
    <div class="container row center-align">
        <div class="col s12 m8 l8 copy-right">
            本站由ZhouYong 技术分享，心得分享.
        </div>
        <div class="col s12 m4 l4 social-link"><a href="#!" class="tooltipped" data-tooltip="邮件联系我: zy20081@126.com" data-position="top" data-delay="50">
    <i class="fa fa-envelope-open"></i>
</a>
<a href="#!" class="tooltipped" data-tooltip="QQ联系我: 314153271" data-position="top" data-delay="50">
    <i class="fa fa-qq"></i>
</a>

<a href="/atom.xml" class="tooltipped" target="_blank" data-tooltip="RSS 订阅" data-position="top" data-delay="50">
    <i class="fa fa-rss"></i>
</a>
</div>
    </div>
</footer>

<div class="progress-bar"></div>


<!-- 搜索遮罩框 -->
<div id="searchModal" class="modal">
    <div class="modal-content">
        <div class="search-header">
            <span class="title">搜索</span>
            <input type="search" id="searchInput" name="s" placeholder="请输入搜索的关键字" class="search-input" autofocus>
        </div>
        <div id="searchResult"></div>
    </div>
</div>

<script src="/js/search.js"></script>
<script type="text/javascript">
    searchFunc("/" + "search.xml", 'searchInput', 'searchResult');
</script>
<!-- 回到顶部按钮 -->
<div id="backTop" class="top-scroll">
    <a class="btn-floating btn-large waves-effect waves-light" href="#!">
        <i class="fa fa-angle-up"></i>
    </a>
</div>


<script src="/libs/materialize/js/materialize.min.js"></script>
<script src="/libs/masonry/masonry.pkgd.min.js"></script>
<script src="/libs/aos/aos.js"></script>
<script src="/libs/scrollprogress/scrollProgress.min.js"></script>
<script src="/libs/lightGallery/js/lightgallery-all.min.js"></script>

<script src="/libs/others/clicklove.js"></script>

<script src="/js/matery.js"></script>
<!-- Global site tag (gtag.js) - Google Analytics -->


</body>
</html>